Cho hàm số y=f(x) có đạo hàm f ' x = x x - 1 2 x - 2 . Tìm khoảng nghịch biến của đồ thị hàm số y=f(x).

A.  - ∞ ; 0 , 1 ; 2

B.  0 ; 1

C.  0 ; 2

D.  2 ; + ∞

Chiến tranh thế giới thứ 2 kết thúc khi

A. Phát xít Italia bị sụp đổ. 

B. Nhật Bản đầu hàng không điều kiện. 

C. Mĩ ném bom nguyên tử xuống Nhật. 

D. Phát xít Đức bị tiêu diệt.

\(\frac{x-5}{7}=\frac{x+9}{6}\Rightarrow6x-30=7x+63\Leftrightarrow x=-30-63=-93\)

đúng nha

Talking at you family:

Hello ebey body. My full name is Nguyen Thi Lan. I am thirteen years old. I am class 7B at Dang Le Secondary School. My family has 4 people: My father, my mother, my sister and I. My father is fithty years old. He is teacher. He teaches at Dang Le Primary School. My mother is doctor. She works at the hospital from 7:30 to 10:30 everyday. She likes cooking. She cooks well. My sister is twelve years old. My sister likes arranging flowers. I am thirteen years old/ I like arranging flowers, too. We often buy flowers to decorate to our house. At weekend, my father takes me and my sister to the zoo or to the park. I love my family so much.